Expansion valve for steam



Jan. 21, 1936. J. LAVERGNE EXPANSION VALVE FQR STEAM Filed Aug. 25, :1934

example an embodiment of Patented Jan. 21, 1936 EXPANSION VALVE ron STEAM Jean Lavergne, Paris, France, assignor to Society Compagnie dc Chaufl'age Central par le Vide,

Neuilly-sur-Scinc, Sein of France e, France, a corporation Application August 25, 1934, Serial No. 741,486 France September 27, 1933 1 Claim.

The present invention relates to an apparatus for the expansion of steam, from a pressure above chiefly adapted for use in steam-heating plants with variable vacuum.

The steam-heating plants employing a vacuum comprise expansion apparatus interposed between a high-pressure steam pipe connected with the controlled by a float which is the parts of a If the pressure in the other part is constant, the vacuum produced in the low-pressure pipe will eflect a constant lowering oi. the liquid in the manometer, thus producing a displacement of the float corresponding admission of a quantity of steam equal to the supply of steam circulating in the heating plant.

In the case oivheating with the use of a variable vacuum, to which the present invention is applicable, such heating may be efl'ected at absoliquid typ cally, for instance by thermostats.

The accompanying drawing shows by way of the invention.

the manometric system.

The apparatus consists of a main actuated by the amplifying lever It, at whose end is suspended a float ll located in the recipient l.

A second recipient I2, situated at lower level than the recipient I, is connected with the latter by a pipe and forms the second part 01 the manometric device containing liquid. A neck l4 connected with the recipient I2 is connected by a pipe ll with a central tank l5 containing air which is compressed at a constant pressure. A diaphragm I1 is mounted at the outlet 01' the comwhich serves to evacuate a greater or less amount of the air contained in the system, and thus to regulate the pressure prevailing in the latter. The other branch is provided with a thermostat serving to automatically regulate a small discharge of air, thus regulating the pressure in the tank l2. This affords either a central regulating by hand, by operating one 01 the closing cocks l9, or an automatic central regulating by thermostat. It is further possible to eliminate the effect of the regulating by hand and by ther- In the first place, the recipient I2 is filled with mercury up to the necessary level 20. The neck 3, for the expanded steam, is connected with the system of steam heating in a vacuum, and the neck 2 is connected with a central supply of steam at any pressure.

it being exerted to the maximum in the pipe I6 when the cocks l9 are closed; the opening of one thermostatic control.

A single air tank may be employed for the cont ol of a certain number of expansion devices, 66

10 phragm, cocks and thermostat.

I claim: An expansion device for obtaining a fluid under a variable vacuum, applicable to steam heating plants with variable vacuum comprising two branches 0! a manometer o! the liquid type, a float arranged in the upper branch, a steam chamber communicating with said upper branch, a regulating ventil in said chamber connected with said float, a fluid tank under constant pressure communicating by a reduced aperture and a conduit with the lower branch, and cocks connected with said conduit tor regulating the pressure or the 10 lower branch.

JEAN LAVERGNE. 

